GLAST LAT ProjectPeer Review, March 24-25, E2 1 Gamma-ray Large Area Space Telescope 7E2: EM test plans GLAST Large Area Telescope: GLAST Large Area Telescope: Tracker Subsystem Nicola Mazziotta University and INFN Bari - Italy

GLAST LAT ProjectPeer Review, March 24-25, E2 2 Outline  Test strategies  First results  Panel vib plan  Tray thermal plan  Tower vib plan  Tower thermal plan  EM Matrix plan Reference LAT Documents: 1.LAT-MD-00408, LAT Instrument Performance Verification Plan 2.LAT-SS-00788, LAT Environmental Specification 3.LAT-TD-01005, Thermal Test Results on Thick Converter Mock-up Trays 4.LAT-TD-01249, Thermal Test Results for Pre-Engineering Model Trays 5.LAT-PS-01584, LAT Tracker Tray SSD Ladder Panel Assembly Procedure 6.LAT-TD-01004, EM Tray Vibration Test Plan 7.LAT-TD-01037, EM Tray Thermal Test Plan

GLAST LAT ProjectPeer Review, March 24-25, E2 3 Tray assembly&test sequence Tray factory (panels)Vibration testLadder factory Tray assembly: ladders and MCMs on trays Thermal cyclesStacked cosmic rays*Electrical testFast electrical test*Tower assembly * Live trays

GLAST LAT ProjectPeer Review, March 24-25, E2 4 Tray vib levels Frequency (Hz) ASD Qual Level (g 2 /Hz) ASD Accept Level (g 2 /Hz) ASD Launch Level(g 2 /Hz) dB/oct dB/oct Overall14.0 g rms 10.0 g rms 7 g rms Duration2 min1 min Random vibration Frequency (Hz) ASD WN Level(g 2 /Hz) Overall g rms Duration (min) 20 ÷ White Noise Frequency range 20  2000 Hz Sweep rate2 oct/min Target Amplitude 0.5 g 0-pk Sine sweep

GLAST LAT ProjectPeer Review, March 24-25, E2 5 Tray vib set up Accelerometers position: Control: two mono-axial accelerometers positioned on two of the four L-shaped block TP1&TP2 Fixture: three mono axial accelerometers placed on a corner on one of the four L- shaped block TP6 Tray: one three-axial accelerometer in the middle TP5 Centrotecnica set up: - 1 LDS V864LT shake table - 2 fixtures - 9 read out channels - 4 trays/day test rate capability W side on the top

GLAST LAT ProjectPeer Review, March 24-25, E2 6 Tray vib sequence thrust axis StepDescription TestLevel 1Fixture, tray and accelerometers mounting 2Fixture calibration and tray resonance search Sine sweep0.5 g 0-pk 3Pre-random vibration White noise0.45 g rms 4Random vibration Launch 5Post/Pre-random vibration White noise0.45 g rms 6Random vibration Acceptance 7Post/Pre-random vibration White noise0.45 g rms 8Random vibration Qualification 9Post-random vibration White noise0.45 g rms 10Normal mode check Sine sweep0.5 g 0-pk 11Dismounting 12Test completion

GLAST LAT ProjectPeer Review, March 24-25, E2 7 First results – TG07 (1) Sine sweep before/after randomRandom vibration + White noise Resonance search: 0 = 815 Hz, Q  51 Resonance check: 0 = 809 Hz, Q  49 Z accelerometer response X accelerometer response Y accelerometer response

GLAST LAT ProjectPeer Review, March 24-25, E2 8 Light ≈ 1000Hz ≈ 800Hz Heavy tray Mid tray Last Vib Runs (Mar, 17-19) (1) ≈ 660Hz

GLAST LAT ProjectPeer Review, March 24-25, E2 9 Last Vib Runs (Mar, 17-19) (2) “Watch-dog” Input-notched: 13.6 g rms Output-notched: 59.6 g rms Applied notching on qual ASD: output ≤ 16 g 2 /Hz (  Q=10) “Watch-dog” Heavy tray (TS05) 660Hz  Output-expected: g rms

GLAST LAT ProjectPeer Review, March 24-25, E2 10 EM Vib Runs Summary (16 trays) All trays first mode › 500 Hz No relevant changes in the resonance frequency after the random

GLAST LAT ProjectPeer Review, March 24-25, E2 11 Thermal tests on pre-EM trays: set-up Wheatstone bridge configuration (Labview) Si Strain gauge Reference Strain gauge on quartz 1 m 3 Procedures: LAT-TD-1037; Pre-EM Results: LAT-TD-1249 Service box

GLAST LAT ProjectPeer Review, March 24-25, E2 12 Thermal tests on pre-EM trays: some results Silicon temperature delay  45 min plateau: dT/dt < 3°C/hr T chamber T silicon plateau  5 hr

GLAST LAT ProjectPeer Review, March 24-25, E2 13 Tray thermal levels AcceptanceQualification/Survival Temperature Range-20°C  35°C-30°C  50°C # of cycles44 Temperature rate20°C/hr Pressure1 atm T-C ‹ Torr T-V 1 atm T-C ‹ Torr T-V T extreme5 hr Total Duration hr hr T-C: Thermal cycle (dummy trays) T-V: Thermal vacuum (live tray) On orbit temperature range -15°C  30°C

GLAST LAT ProjectPeer Review, March 24-25, E2 14 Tray thermal sequence StepDescription Level 0Strain gauges and thermocouple set up 1Chamber set up 2Strain gauges calibration 3Thermal cycles Qualification 4Dismounting 5Test completion The EM dummy trays will be tested at ambient pressure into the service boxes

GLAST LAT ProjectPeer Review, March 24-25, E2 15 Tower vib levels Frequency(Hz)ASD Acceptance Level (g 2 /Hz) ASD Qualification Level (g 2 /Hz) dB/oct dB/oct Overall8.7 grms12.3 grms Duration1 min/axis2 min/axis Low frequency sine sweep Frequency range 20  2000 Hz Sweep rate2 oct/min Target Amplitude 0.5 g 0-pk High frequency sine sweep Frequency (Hz) ASD WN Level(g 2 /Hz) Overall g rms Duration (min) 20 ÷ White Noise Random vibration

GLAST LAT ProjectPeer Review, March 24-25, E2 16 Tower vib set up Accelerometers set up (TBR): 1.3 axial on the shaker table (control accelerometer) 2.3 axial on the center of the bottom tray lower surface 3.3 axial on the center of the top tray upper surface 4.3 axial accelerometer +X sidewall center of the thermal boss tray number 12; 5.3 axial accelerometer +Y sidewall near the center of the tray number 10; 6.3 axial accelerometer +Y sidewall center of the thermal boss of the tray number 1; 7.3 axial accelerometer +Y sidewall center of the thermal boss of the tray number 19; 8.3 axial accelerometer -X sidewall center of the thermal boss of the tray number 10; 9.3 axial accelerometer -Y sidewall near the center of the tray number 10, on the center plane;

GLAST LAT ProjectPeer Review, March 24-25, E2 17 Tower vib sequence X,Y,Z axis For each axis StepDescription TestLevel 1Fixture, tower and accelerometers mounting 2Fixture calibration High frequency sine sweep 0.5 g 0-pk 3 Normal mode search High frequency sine sweep 0.5 g 0-pk 4Pre-random vibration White noise0.45 g rms 5Random vibration -6 dB Qual 6Post/Pre-random vibration White noise0.45 g rms 7Random vibration -3 dB Qual 8Post/Pre-random vibration White noise0.45 g rms 9Random vibration 0 dB Qual 10Post-random vibration White noise0.45 g rms 11Normal mode check High frequency sine sweep 0.5 g 0-pk 12 Low frequency test Low frequency sine sweep Qual 13Dismounting 14Test completion

GLAST LAT ProjectPeer Review, March 24-25, E2 18 Tower thermal levels Thermal-Vacuum cycling/Qual-Surv level Ranges-30°C  50°C # of cycles8 (12) Temp. rate20°C/hr Pressure10 -5 Torr extreme12 hr Total Duration256 (384) hr + stabilization

GLAST LAT ProjectPeer Review, March 24-25, E2 19 Tower thermal set up Additional thermocouples (TBR): 1.+Y sidewall center of the thermal boss of the tray number 1; 2.+X sidewall center of the of the tray number 1, on the center plane; 3.+Y sidewall center of the thermal boss of the tray number 19; 4.+X sidewall center of the of the tray number 19, on the center plane; 5.-X sidewall center of the thermal boss of the tray number 10; 6.-Y sidewall near the center of the tray number 10, on the center plane The tower has a large number of thermocouples in the read out cables that can be acquired by using the TKR DAQ system. The temperature control point for the cold part of the cycle will be the coldest thermocouple, while the control point for the hot part of the cycle will be the hottest one. Tower covered with a thermal blanket during T-V cycles.

GLAST LAT ProjectPeer Review, March 24-25, E2 20 Tower thermal sequence StepDescription Level 0(Strain gauges and) Thermocouple set up 1Chamber set up 2(Strain gauges calibration) 3Thermal vacuum cycles Qualification/Survival 4Dismounting 5Test completion

GLAST LAT ProjectPeer Review, March 24-25, E2 21 EM matrix ItemQuantityQuantity to testHigh freq sine Sweep HzRandom VibeWhite noiseLow freq sine Sweep5-50 HzFunctionalThermal CycleThermal VacuumTest site Panels24 Qual Z axis Qual Z axis Centrotecnica (vib) Live Trays 51Qual Z axis Qual Z axis QualCentrotecnica (vib) Alenia (thermal-vac) Dummy Trays 195 vib 19 ther Qual Z axis Qual Z axis QualCentrotecnica (vib) INFN Perugia (in Terni) (thermal) Tower11Qual X,Y,Z Qual X,Y,Z QualAlenia